This next section is under developed at the moment but the point is that it is natural
to model in ER what ER is and this is the ER meta model. This evolves as more concepts
such as commutative diagrams are added. At the moment what we have here is a simple
version.

The next section comprises notes on the different ways that ordinal numbers can be
represented in entity modelling and of the constructions that follow on from them.
These are thoughts towards foundations rather than being of practical value at the
moment.